| 摘要 |
An articulation mechanism comprising a fixed cheek web, a rotational cheek web fitted with a circular tooth portion, two toothed inserts arranged at 120 degrees from each other, sliding relative to the fixed cheek web and adapted to engage with the circular tooth portion so as to lock the rotational cheek web, a cam to control the movement of the inserts, and a stop belonging to the fixed cheek web, arranged at 120 degrees from each of the inserts and acting as a support for the cam. |
